US3215895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety gate circuit
Assignee: RTX Corp
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Filing: 1963-05-31
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Granted: 1965-11-02
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Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 Richard F Lach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:44
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/08; G05D1/0808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN COMBINATION, AN A.C. SOURCE OF SUPPLY CONNECTED TO A TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING, CIRCUIT MEANS FOR SENSING A SHORT CIRCUIT TO GROUND OR OPEN CIRCUIT IN SAID TRANSFORMER WINDINGS COMPRISING A SOURCE OF DIRECT CURRENT HAVING TWO TERMINALS ONE OF SAID TERMINALS BEING CONNECTED WITH ONE OF SAID WINDINGS AND THE OTHER OF SAID TERMINHALS BEING GROUNDED, SWITCHING MEANS CONNECTED WITH SAID OTHER WINDING, AND MEANS DIRECTLY CONNECTING SAID ONE WINDING WITH THE OTHER SAID WINDING TO PROVIDE A CIRCUIT PATH TO GROUND FOR SAID DIRECT CURRENT THROUGH SAID TRANSFORMED WINDINGS TO BIAS SAID SWITCHING MEANS TO A FIRST STATE OF OPERATION, SAID BIAS BEING REMOVED AND SAID SWITCHING MEANS BEING SWITCHED TO A SECOND STATE OF OPERATION WHEN SAID DIRECT CURRENT CIRCUIT PATH IS BROKEN OR SAID SHORT TO GROUND OCCURS.
Claim 2
Dependent Claim
138 words
IN COMBINATION, AN A.C. SOURCE OF SUPPLY CONNECTED TO A TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING, CIRCUIT MEANS FOR SENSING A SHORT CIRCUIT TO GROUND OR OPEN CIRCUIT IN SAID TRANSFORMER WINDINGS COMPRISING A SOURCE OF DIRECT CURRENT HAVING TWO TERMINALS ONE OF SAID TERMINALS BEING CONNECTED WITH ONE OF SAID WINDINGS AND THE OTHER OF SAID TERMINHALS BEING GROUNDED, SWITCHING MEANS CONNECTED WITH SAID OTHER WINDING, AND MEANS DIRECTLY CONNECTING SAID ONE WINDING WITH THE OTHER SAID WINDING TO PROVIDE A CIRCUIT PATH TO GROUND FOR SAID DIRECT CURRENT THROUGH SAID TRANSFORMED WINDINGS TO BIAS SAID SWITCHING MEANS TO A FIRST STATE OF OPERATION, SAID BIAS BEING REMOVED AND SAID SWITCHING MEANS BEING SWITCHED TO A SECOND STATE OF OPERATION WHEN SAID DIRECT CURRENT CIRCUIT PATH IS BROKEN OR SAID SHORT TO GROUND OCCURS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |